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Old 01-22-2011, 08:56 PM   #1 (permalink)
pezsez
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HELP PLEASE Engine shut off while driving

Hey guys the other day my engine just died for no reason sorta scary actually
I just put new fuel filter and new injectors in it, and new batteries. I also put a new turbo wastegate spring on it too. What do you think would cause it to just shut off
and or some times sputter.

Last edited by pezsez; 01-22-2011 at 08:57 PM.
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Old 01-22-2011, 09:57 PM   #2 (permalink)
Bryce_Burden90
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What year model truck is yours? My 94 was doing the same thing when I bought it. Sometimes it would start right up again, other times not. Very aggravating. Anyhow, turned out to be the PMD (pump mounted driver), which is the little black box on the side of the injection pump that controls the pump on 94 and up 6.5s. I'm sure that there are probably other things that could cause this problem, but I know that mine did the same thing and it cleared right up soon as I replaced the PMD. If that turns out to be the problem, another suggestion is to relocate the PMD. Not only will it be so much easier, as the PMD is a pain in the ass to get to, but it will keep it cooler (heat is its worst enemy). And if that turns out to be the problem, my suggestion would be to go somewhere for an aftermarket one, as my local GM dealer quoted me $514 dollars for a new one, and that was at my cost as a mechanic.

Hope this helps!!

Bryce
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Old 01-22-2011, 10:00 PM   #3 (permalink)
PrivatePilot
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Welcome to Dieselplace. Please start by filling out your signature with details of your truck so that members know what year your truck is.

You may then wish to copy, fill out, and paste the Diagnostic Checklist stickied at the top of this forum in this thread.

This sounds like a very common problem related to the PMD, but it's important to do some basic diagnostics before automatically condemning it.
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Old 01-22-2011, 10:14 PM   #4 (permalink)
Bryce_Burden90
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Quote:
Originally Posted by privatepilot View Post
Welcome to Dieselplace. Please start by filling out your signature with details of your truck so that members know what year your truck is.

You may then wish to copy, fill out, and paste the Diagnostic Checklist stickied at the top of this forum in this thread.

This sounds like a very common problem related to the PMD, but it's important to do some basic diagnostics before automatically condemning it.

Agreed, the PMD may not be the culprit, it could very well be something cheap and easy to fix. We hooked it up to the scanner at the shop and found out what the problem was.

And sorry I didn't post this earlier but welcome aboard!!

Bryce
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1983 Ford F350 Winch Truck 6.9 (Ol' Betsy)
1986 Ford F250 4x4 6.9 (The Green Pile)
2002 Ford F350 CC DRW 7.3 PowerStroke (White Lightnin')
1983 Chevrolet K30 6.2 (The Blue Bomb)

1965 Ford F100 240 I6 (Ol' Pink)
1978 AMC Gremlin 350 SBC 700R4 9" Rear (The Great Pumpkin)

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Old 01-22-2011, 10:40 PM   #5 (permalink)
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Quote:
Originally Posted by Bryce_Burden90 View Post
Agreed, the PMD may not be the culprit, it could very well be something cheap and easy to fix. We hooked it up to the scanner at the shop and found out what the problem was.

And sorry I didn't post this earlier but welcome aboard!!

Bryce
What was your problem that showed up on the scanner.
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Old 01-22-2011, 10:51 PM   #6 (permalink)
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When I was having trouble with my truck, it never actually threw any codes, but our scanner (Snap-On MODIS) has features that let you check driveability stats (timing,temp,oil pressure,etc.) and when we hooked up to it the TDC offset was a little off, boss diagnosed it as the PMD, replaced it and been running fine ever since. Replaced the LP first and no help there.

Bryce
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1983 Ford F350 Winch Truck 6.9 (Ol' Betsy)
1986 Ford F250 4x4 6.9 (The Green Pile)
2002 Ford F350 CC DRW 7.3 PowerStroke (White Lightnin')
1983 Chevrolet K30 6.2 (The Blue Bomb)

1965 Ford F100 240 I6 (Ol' Pink)
1978 AMC Gremlin 350 SBC 700R4 9" Rear (The Great Pumpkin)

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Old 01-22-2011, 11:21 PM   #7 (permalink)
pezsez
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ya its a 95 6.5 diesel so you guys think ints the pmp the little black box right under the intake manifold?

here is my diagonstic list
batteries - NEW
fuel injectors- NEW
Fuel flilter- New

then engine was rebuilt completely about 4000 miles ago right before i owned it.
It got new pistons, rings, rods , seals, bearings, oil pump, and new heads.

so but the pmp and fuel pump are old
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i have a 95 chevy 6.5 diesel 5spd. its a 3500 cheyenne
with utility box and welder

Last edited by pezsez; 01-22-2011 at 11:29 PM.
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Old 01-23-2011, 12:20 AM   #8 (permalink)
Bryce_Burden90
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Quote:
Originally Posted by pezsez View Post
ya its a 95 6.5 diesel so you guys think ints the pmp the little black box right under the intake manifold?

here is my diagonstic list
batteries - NEW
fuel injectors- NEW
Fuel flilter- New

then engine was rebuilt completely about 4000 miles ago right before i owned it.
It got new pistons, rings, rods , seals, bearings, oil pump, and new heads.

so but the pmp and fuel pump are old
Like the others said it could very well be the PMD, but before you jump straight to that I'd look into it a little deeper, have you checked your lift pump (located in the fuel line along the inside of the frame somewhere under drivers door)? That could be another possible cause of the problem. I'm by no means saying that the PMD is bad, but that is a common symptom of a PMD that is bad. And if that is the case, get ready cause they are a pain in the ass to get off, boss claims there's a way to do it without having to, but I had to pull my intake manifold off to get to all the screws. Good Luck and keep us posted.

Bryce
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1983 Ford F350 Winch Truck 6.9 (Ol' Betsy)
1986 Ford F250 4x4 6.9 (The Green Pile)
2002 Ford F350 CC DRW 7.3 PowerStroke (White Lightnin')
1983 Chevrolet K30 6.2 (The Blue Bomb)

1965 Ford F100 240 I6 (Ol' Pink)
1978 AMC Gremlin 350 SBC 700R4 9" Rear (The Great Pumpkin)

Too Many More To List

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Old 01-23-2011, 01:49 AM   #9 (permalink)
pezsez
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Quote:
Originally Posted by Bryce_Burden90 View Post
Like the others said it could very well be the PMD, but before you jump straight to that I'd look into it a little deeper, have you checked your lift pump (located in the fuel line along the inside of the frame somewhere under drivers door)? That could be another possible cause of the problem. I'm by no means saying that the PMD is bad, but that is a common symptom of a PMD that is bad. And if that is the case, get ready cause they are a pain in the ass to get off, boss claims there's a way to do it without having to, but I had to pull my intake manifold off to get to all the screws. Good Luck and keep us posted.

Bryce
Ya i just did the injectors the passangers side was a bitch.
had to take off the turbo ect...... intake manifold shouldnt be too hard.
ill check out both.

how do you know if its the lift pump or the pmd ?
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i have a 95 chevy 6.5 diesel 5spd. its a 3500 cheyenne
with utility box and welder
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Old 01-23-2011, 07:08 AM   #10 (permalink)
laska
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Originally Posted by Bryce_Burden90
Like the others said it could very well be the PMD, but before you jump straight to that I'd look into it a little deeper, have you checked your lift pump (located in the fuel line along the inside of the frame somewhere under drivers door)? That could be another possible cause of the problem. I'm by no means saying that the PMD is bad, but that is a common symptom of a PMD that is bad. And if that is the case, get ready cause they are a pain in the ass to get off, boss claims there's a way to do it without having to, but I had to pull my intake manifold off to get to all the screws. Good Luck and keep us posted.

Bryce
Pmd fail is caused by heat! You don't replace it. You Relocate a new one away form engine heat, such as tucked in front bumper or grill. Put it on a heat sink. Simply un plug the old one and add a extision cable. Theres mass info here on it. read up im sure others will chim in.......Laska
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